<template>
  <div :style="getPlaceholderDomStyle" v-if="getIsShowPlaceholderDom"></div>
  <div :style="getWrapStyle" :class="getClass">
    <LayoutHeader v-if="getShowInsetHeaderRef" />
    <MultipleTabs v-if="getShowTabs" />
  </div>
</template>
<script lang="ts" setup name="LayoutMultipleHeader">
import { unref, computed, CSSProperties } from 'vue'

import LayoutHeader from './index.vue'
import MultipleTabs from '../tabs/index.vue'

import { useHeaderSetting } from '@/hooks/setting/useHeaderSetting'
import { useMenuSetting } from '@/hooks/setting/useMenuSetting'
import { useFullContent } from '@/hooks/web/useFullContent'
import { useMultipleTabSetting } from '@/hooks/setting/useMultipleTabSetting'
import { useAppInject } from '@/hooks/web/useAppInject'
import { useDesign } from '@/hooks/web/useDesign'
import { useLayoutHeight } from '../content/useContentViewHeight'

const HEADER_HEIGHT = 48

const TABS_HEIGHT = 32
const { setHeaderHeight } = useLayoutHeight()
const { prefixCls } = useDesign('layout-multiple-header')

const { getCalcContentWidth, getSplit } = useMenuSetting()
const { getIsMobile } = useAppInject()
const { getFixed, getShowInsetHeaderRef, getShowFullHeaderRef, getHeaderTheme, getShowHeader } = useHeaderSetting()

const { getFullContent } = useFullContent()

const { getShowMultipleTab } = useMultipleTabSetting()

const getShowTabs = computed(() => {
  return unref(getShowMultipleTab) && !unref(getFullContent)
})

const getIsShowPlaceholderDom = computed(() => {
  return unref(getFixed) || unref(getShowFullHeaderRef)
})

const getWrapStyle = computed((): CSSProperties => {
  const style: CSSProperties = {}
  if (unref(getFixed)) {
    style.width = unref(getIsMobile) ? '100%' : unref(getCalcContentWidth)
  }
  if (unref(getShowFullHeaderRef)) {
    style.top = `${HEADER_HEIGHT}px`
  }
  return style
})

const getIsFixed = computed(() => {
  return unref(getFixed) || unref(getShowFullHeaderRef)
})

const getPlaceholderDomStyle = computed((): CSSProperties => {
  let height = 0
  if ((unref(getShowFullHeaderRef) || !unref(getSplit)) && unref(getShowHeader) && !unref(getFullContent)) {
    height += HEADER_HEIGHT
  }
  if (unref(getShowMultipleTab) && !unref(getFullContent)) {
    height += TABS_HEIGHT
  }
  setHeaderHeight(height)
  return {
    height: `${height}px`
  }
})

const getClass = computed(() => {
  return [prefixCls, `${prefixCls}--${unref(getHeaderTheme)}`, { [`${prefixCls}--fixed`]: unref(getIsFixed) }]
})
</script>
<style lang="less" scoped>
@prefix-cls: ~'@{namespace}-layout-multiple-header';

.@{prefix-cls} {
  transition: width 0.2s;
  flex: 0 0 auto;

  &--dark {
    margin-left: -1px;
  }

  &--fixed {
    position: fixed;
    top: 0;
    z-index: @multiple-tab-fixed-z-index;
    width: 100%;
  }
}
</style>
